Mechanisms of Quasi-Brittle Failure in Metals and Intermetallic Compounds.
Abstract
This is the final report for this program. Progress was made both on the experimental and theoretical aspects of the program. The experimental results demonstrate that single- and polycrystalline Al3Ti in the Ll2 form (by adding Fe or Cr) is intrinsically brittle; although second phase particles can make it even more brittle. The theoretical portion of the program has produced a new theory of the brittle-to-ductile transition temperature involving dislocation-screening assisted homogeneous dislocation nucleation at the transition. The model provides realistic values of the transition temperature and reduces to the well-known Rice-Thomson model at zero temperature and to the equally well-known Kosterlitz-Thouless model at zero stress.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 24, 1995
- Accession Number
- ADA320460
Entities
People
- David P. Pope
- Vaclav Vitek
Organizations
- University of Pennsylvania